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----------------------------------------------------------------------------

%parser calc_grammar

%decl calc_parser.h

%impl calc_parser.cpp

%token_prefix Token_

%token number

%token lparen

%token rparen

%token plus

%token minus

%start Goal

/:

#ifndef CALC_PARSER_H

#define CALC_PARSER_H

#include "qparser.h"

#include "calc_grammar_p.h"

class CalcParser: public QParser<CalcParser, $table>

{

public:

  int nextToken();

  void consumeRule(int ruleno);

};

#endif // CALC_PARSER_H

:/

/.

#include "calc_parser.h"

#include <QtDebug>

#include <cstdlib>

void CalcParser::consumeRule(int ruleno)

  {

    switch (ruleno) {

./

Goal: Expression ;

/.

case $rule_number:

  qDebug() << "value:" << sym(1);

  break;

./

PrimaryExpression: number ;

PrimaryExpression: lparen Expression rparen ;

/.

case $rule_number:

  sym(1) = sym (2);

  break;

./

Expression: PrimaryExpression ;

Expression: Expression plus PrimaryExpression;

/.

case $rule_number:

  sym(1) += sym (3);

  break;

./

Expression: Expression minus PrimaryExpression;

/.

case $rule_number:

  sym(1) -= sym (3);

  break;

./

/.

    } // switch

}

#include <cstdio>

int main()

{

  CalcParser p;

  if (p.parse())

    printf("ok\n");

}

./